Which of the following examples has three beats in each measure?

D.
1 Line with closed dot equals 1 beat.
2 lines with closed dot equals 1 beat.
1 line with opened dot equals 2 beats.

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"